It does what it says. Makes sounds in different frequencies and is like a dog whistle. Dont hate the app if your dog doesnt respond to the noise. You probably need to turn up the volume or change pitch. Maybe your dog just doesnt care about that sound because there isnt anything associated with it (yet).. They arent selling you a dog trick/skill, just a "dog whistle" app. And that part works. I liked the different settings and presets. Excellent! For that, you get four of em
Logan Explosion about Dog Whistle, v1.6